<template>
    <div class="header">
        <!-- 折叠图片 -->
        <div class="collapse-btn" @click="collapseChange">
            <i class="el-icon-menu"></i>
        </div>
        <div class="logo">电信网备件管理系统</div>
        <div class="header-right">
            <div class="btn-fullscreen" @click="handleFullScreen">
                <el-tooltip :content="fullscreen?`取消全屏`:`全屏`" placement="bottom">
                    <i class="el-icon-rank"></i>
                </el-tooltip>
            </div>
            <div class="user-avator">
                <img src="../../assets/img/user.jpg"/>
            </div>
            <el-dropdown class="user-name" trigger="click" @command="handleCommand">
                <span class="el-dropdown-link">
                    {{userName}}
                    <i class="el-icon-caret-bottom"></i>
                </span>
                <el-dropdown-menu slot="dropdown">
                    <el-dropdown-item command="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
            </el-dropdown>
        </div>
    </div>


</template>

<script>
    import bus from "../../assets/js/bus";
    export default {
        data(){
            return{
                collapse: false,
                fullscreen:false
            }
        },
        computed:{
            userName(){
                return localStorage.getItem('username');
            }
        },
        methods:{
            //侧边栏折叠
            collapseChange(){
                this.collapse = !this.collapse;
                bus.$emit('collapse',this.collapse);
            },
            //全屏事件
            handleFullScreen(){
                if(this.fullscreen){
                    if(document.exitFullscreen){
                        document.exitFullscreen();
                    }else if(document.webkitCancelFullScreen){      //safari 、Chrome
                        document.webkitCancelFullScreen();
                    }else if (document.mozCancelFullScreen){        //firefox
                        document.mozCancelFullScreen();
                    }else if(document.msExitFullScreen){            //ie
                        document.msExitFullScreen();
                    }
                }else{
                    let element = document.documentElement;
                    if(element.requestFullscreen){
                        element.requestFullscreen();
                    }else if(element.webkitRequestFullScreen){      //safari 、Chrome
                        element.webkitRequestFullScreen();
                    }else if(element.mozRequestFullScreen){         //firefox
                        element.mozRequestFullScreen();
                    }else if (element.msRequestFullScreen){         //ie
                        element.msRequestFullScreen();
                    }
                }
                this.fullscreen = !this.fullscreen;
            },
            handleCommand(command){
                if(command === "logout"){
                    localStorage.removeItem('username');
                    localStorage.removeItem('token');
                    localStorage.removeItem('permission');
                    this.$router.push("/");
                }
            }
        }
    }
</script>

<style scoped>
    .header {
        position: relative;
        background-color: #253041;
        box-sizing: border-box;
        width: 100%;
        height: 70px;
        font-size: 22px;
        color: #ffffff;
    }

    .collapse-btn {
        float: left;
        padding: 0 21px;
        cursor: pointer;
        line-height: 70px;
    }

    .header .logo {
        float: left;
        line-height: 70px;
    }

    .header-right {
        float: right;
        padding-right: 50px;
        display: flex;
        height: 70px;
        align-items: center;
    }

    .btn-fullscreen {
        transform: rotate(45deg);
        margin-right: 5px;
        font-size: 24px;
    }

    .user-avator {
        margin-left: 20px;
    }

    .user-avator img {
        display: block;
        width: 40px;
        height: 40px;
        border-radius: 50%;
    }

    .user-name {
        margin-left: 10px;
    }

    .el-dropdown-link {
        color: #ffffff;
        cursor: pointer;
    }
</style>
